<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>后台管理</title>
  <style>
    html,
    body,
    #root {
      height: 100%;
    }
  </style>
</head>

<body>
  <div id="root"></div>
</body>

</html>